Registering your website with Google Webmaster Tools can give you an idea of how many links Google thinks is relevant for your website.Yahoo Site Explorer will show all of the back links it has found for your website and it seems to list the links in order of importance.The link command does not work in Google search anymore.The best links are those that appear naturally. Commenting on blogs is a great way to build one way links but those links do not happen naturally and have limited weight with Google. Any link, especially on blogs will help to have your website indexed but there can be very little if any real ranking power for the link text in those blog comments depending on the competitiveness of the keyword. Although, search phrases that are of low value can be greatly influenced by blog comment links.Example: I rank on the first page of Google for the phrase Nashville
SEO. This was done entirely from blog commenting with the link text "Nashville
SEO". This is possible because there is almost no search traffic for that search phrase.